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Round|Natural|GIA

1.21ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 2556636452

Certificate GIA 2556636452

Diamond specifications and retailer prices

From £1,005 GBP
As of November 4, 2026
Save £1,640 GBP (62%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,644 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556636452. Listed at 11 retailers as of November 4, 2026, with prices from £1,005 to £2,644, a £1,640 spread on the same certified stone. NZ Jewellers lists it at £2,644. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.21
Carat
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2556636452
Dimensions6.93 × 6.88 × 4.13 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Twinning Wisp
Top View
6.93 mm6.88 mm1.21 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556636452
Side View
Table 59.0%Crown 31.5°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 59.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £2,644 GBP|Low: £1,005 GBP|High: £2,701 GBP|Avg: £1,304 GBP|-2.1%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 6£1,005 GBP
Retailer 2£1,065 GBP
Retailer 11£1,072 GBP
Retailer 7£1,084 GBP
Retailer 9£1,084 GBP
Retailer 8£1,134 GBP
Retailer 10£1,155 GBP
Retailer 3£1,251 GBP
Retailer 5£1,323 GBP
Retailer 4£1,496 GBP
NZ Jewellers£2,644 GBP

43 data points across 11 retailers

11 retailers£1,005 GBP to £2,644 GBP

A
Cheapest Retailer
-
£1,005 GBP
A
Retailer 2
-
£1,065 GBP
View
A
Retailer 3
-
£1,072 GBP
View
Retailer 4
-
£1,084 GBP
View
Price last confirmed 8 days ago
A
Retailer 5
-
£1,084 GBP
View
A
Retailer 6
-
£1,134 GBP
View
A
Retailer 7
-
£1,155 GBP
View
B+
Retailer 8
-
£1,251 GBP
View
B+
Retailer 9
-
£1,323 GBP
View
B+
Retailer 10
-
£1,496 GBP
View
Most Expensive
B
NZ Jewellers
ae8f5be1-e745-4e7b-8d9d-eb4b15a6ff4c · Nov 5
£2,644 GBP
$3,559 USD
View
10 more retailers have this diamond
Prices start from £1,005 GBPSave up to £1,640 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.21ct Round
£1,005 GBP